U.S. EPA accepted. Polyseed® capsules produce fast, economical analysis with reliable and consistent results. Each capsule contains 100mg of specialized bacterial cultures ideal for use in a broad range of areas involving degradation of industrial and municipal wastewater. Contents of capsule are added to one-half liter of APHA standard dilution water at 20°C (68°F), then stirred and aerated for at least 60 minutes. Resulting mixture provides enough seed inoculum for up to 200 BOD tests. Also available as Polyseed NX® which contains a chemical additive for the inhibition of nitrifying bacteria in wastewater samples. In an easy-to-use capsule Polyseed NX® is packaged and designed to provide a standard seed source for the degradation of both industrial and municipal wastewater in CBOD5 analyses. The amount of nitrification inhibitor used is comparable to that which is stated in Standard Methods as necessary for sufficient inhibition. For best results, use within one year of purchase.